Orthonectida


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Orthonectida

[‚ȯr·thə′nek·tə·də]
(invertebrate zoology)
An order of Mesozoa; orthonectids parasitize various marine invertebrates as multinucleate plasmodia, and sexually mature forms are ciliated organisms.
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Molecular analyses that include other lower turbellarian groups (for example, the Catenulida and the Nemertodermatida) and the Orthonectida, a group tentatively included in the Mesozoa, will provide further information for understanding the phylogenetic position of the dicyemids.